A 3-phase, 380 V, 50 Hz, Y-connected 12-pole wound induction machine derive a load at a...

 

Transcribed Image Text:

A 3-phase, 380 V, 50 Hz, Y-connected 12-pole wound induction machine derive a load at a speed of 480 rpm. The total mechanical losses are 450 watt, and the motor parameters in Ohm referred to the stator side are: R₁-0.55 R₂-0.25 X₁=0.6 XM- 128, Rie=250, X₂=0.8 Use the approximate equivalent circuit to determine (the magnetizing circuit shunt the power supply) (a) The input line current, (b) The input active power supplied to the motor, (c) The shaft output torque in Nm, (d) The speed at maximum value of the torque, (e) The value of the resistance, which must be connected in series with the rotor circuit to have the maximum torque at starting. Why do we need the starting torque to be high?. A 3-phase, 380 V, 50 Hz, Y-connected 12-pole wound induction machine derive a load at a speed of 480 rpm. The total mechanical losses are 450 watt, and the motor parameters in Ohm referred to the stator side are: R₁-0.55 R₂-0.25 X₁=0.6 XM- 128, Rie=250, X₂=0.8 Use the approximate equivalent circuit to determine (the magnetizing circuit shunt the power supply) (a) The input line current, (b) The input active power supplied to the motor, (c) The shaft output torque in Nm, (d) The speed at maximum value of the torque, (e) The value of the resistance, which must be connected in series with the rotor circuit to have the maximum torque at starting. Why do we need the starting torque to be high?.